(Swift 3,4,5...) SendGrid -- Send Email with Attachment

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Sends an email with an attachment.

For more information, see https://sendgrid.com/docs/for-developers/sending-email/curl-examples/#sending-a-basic-email-with-attachment

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let http = CkoHttp()!
    var success: Bool

    // Implements the following CURL command:

    // curl --request POST \
    //   --url https://api.sendgrid.com/v3/mail/send \
    //   --header 'authorization: Bearer YOUR_API_KEY' \
    //   --header 'Content-Type: application/json' \
    //   --data '{"personalizations": [{"to": [{"email": "recipient@example.com"}]}],"from": {"email": "sender@example.com"},"subject":"Hello, World!","content": [{"type": "text/html","value": "Hey,<br>Please find attachment."}], "attachments": [{"content": "BASE64_ENCODED_CONTENT", "type": "text/plain", "filename": "attachment.txt"}]}'

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    // Use this online tool to generate code from sample JSON:
    // Generate Code to Create JSON

    // The following JSON is sent in the request body.

    // {
    //   "personalizations": [
    //     {
    //       "to": [
    //         {
    //           "email": "recipient@example.com"
    //         }
    //       ]
    //     }
    //   ],
    //   "from": {
    //     "email": "sender@example.com"
    //   },
    //   "subject": "Hello, World!",
    //   "content": [
    //     {
    //       "type": "text/html",
    //       "value": "Hey,<br>Please find attachment."
    //     }
    //   ],
    //   "attachments": [
    //     {
    //       "content": "BASE64_ENCODED_CONTENT",
    //       "type": "text/plain",
    //       "filename": "attachment.txt"
    //     }
    //   ]
    // }

    let json = CkoJsonObject()!
    json.update("personalizations[0].to[0].email", value: "recipient@example.com")
    json.update("from.email", value: "sender@example.com")
    json.update("subject", value: "Hello, World!")
    json.update("content[0].type", value: "text/html")
    json.update("content[0].value", value: "Hey,<br>Please find attachment.")

    // Load a file to be attached.
    let bd = CkoBinData()!
    success = bd.loadFile("qa_data/pdf/hello.pdf")

    json.update("attachments[0].content", value: bd.getEncoded("base64"))
    json.update("attachments[0].type", value: "application/pdf")
    json.update("attachments[0].filename", value: "hello.pdf")

    http.setRequestHeader("Content-Type", value: "application/json")
    // Adds the "Authorization: Bearer YOUR_API_KEY" header.
    http.authToken = "YOUR_API_KEY"

    var resp: CkoHttpResponse? = http.postJson3("https://api.sendgrid.com/v3/mail/send", contentType: "application/json", json: json)
    if http.lastMethodSuccess == false {
        print("\(http.lastErrorText!)")
        return
    }

    var respStatusCode: Int = resp!.statusCode.intValue
    print("Response Status Code = \(respStatusCode)")
    if respStatusCode != 202 {
        print("Response Header:")
        print("\(resp!.header!)")
        print("Response Body:")
        print("\(resp!.bodyStr!)")
        print("Failed.")
        resp = nil
        return
    }

    resp = nil
    print("Success.")

}